Okay heres the situation, My mother bought her first mercedes (1980 280CE) from a neighbor for $800USD After spending 4 years without and climate control options (the top defroster button was the only working button on the whole unit) I decided to rip apart the dash. I found out that the defroster button happend to be the only button that was "ecetrically" connected the others had some sort of air hose system. I stopped there and gave up but I did try blowing into them and whatnot and starting up the car to see what woudl happen.....nothing happend. Now a year later the car becomes mine and I started researching the issue and found out that these controlls are run by vacuum! I've never seen this before? then again I'm only 17 So to make a long story short I now feel as if this could be a simple problem? Vacuum motor/pump? how could I pinpoint the malfunction? I know that you guys know what your talking about, and have the feeling you can help me out, this is probably a common problem. Thanks in advance!!

-Ben